Add timer and frame counter to SimpleTexture2D.
Add timer and frame counter to SimpleTexture2D.

Can be useful for perf testing.

Bug: angleproject:4729
Change-Id: I26c5fd53a34f4ed21d565e020b7c2058ff7ee6db
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2241621
Reviewed-by: Jonah Ryan-Davis <682bdb9e7d8ba359ef169b8db374e7a99d394a46@google.com>
Reviewed-by: Shahbaz Youssefi <582eeec4f08a2ccd61e3ef52115e6e7c571582de@chromium.org>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

ppy/angle,ppy/angle,ppy/angle,ppy/angle